HR Mainspring No. E543 for FEF 290-310, 330, 340, Alpina 586, Buren 460, 461 - Steel

HR Ev-R-Last mainspring E543 for FEF 290 - 310, 330, 340, Alpina 586, Buren 460, 461 caliber movements, steel, new in envelope. See images for calibers supported and precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.